Order sql table by descending order in C# -

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since id column ordered asc order, want change ordering desc order. have following table enter image description here

i'm using following code in order perform desc ordering, nothing happens in table. 

 private void button4_click(object sender, eventargs e)     {         string columnname = textbox9.text;         try         {             using (sqlconnection cn = new sqlconnection(@"data source=(localdb)\v11.0;attachdbfilename=|datadirectory|\produkt.mdf;integrated security=true"))             {                 cn.open();                 using (sqlcommand command = new sqlcommand("select id, navn, varenr, antal, enhed, priseksklmoms, konto produkttable order [" + columnname +              "] desc", cn))                 {                     command.executenonquery();                 }             }         }         catch (exception ex)         {             messagebox.show("error\n" + ex.message, "error", messageboxbuttons.ok, messageboxicon.error);         }      }

i'm writing column name "id" in textbox9, , executenonquery method returns "-1" every time triggered. why doesn't table perform desired sorting ?.

thanks in advance

from sqlcommand.executenonquery method

for update, insert, , delete statements, return value number of rows affected command. when trigger exists on table being inserted or updated, return value includes number of rows affected both insert or update operation , number of rows affected trigger or triggers. for other types of statements, return value -1. if rollback occurs, return value -1.

since use select statement, so..

by way, should use parameterized queries. kind of string concatenations open sql injection attacks.


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